import fetch from 'dva/fetch';
import { notification } from 'antd';
import { routerRedux } from 'dva/router';
import store from '../index';

const codeMessage = {
  200: '服务器成功返回请求的数据。',
  201: '新建或修改数据成功。',
  202: '一个请求已经进入后台排队（异步任务）。',
  204: '删除数据成功。',
  400: '发出的请求有错误，服务器没有进行新建或修改数据的操作。',
  401: '用户没有权限（令牌、用户名、密码错误）。',
  403: '用户得到授权，但是访问是被禁止的。',
  404: '发出的请求针对的是不存在的记录，服务器没有进行操作。',
  406: '请求的格式不可得。',
  410: '请求的资源被永久删除，且不会再得到的。',
  422: '当创建一个对象时，发生一个验证错误。',
  500: '服务器发生错误，请检查服务器。',
  502: '网关错误。',
  503: '服务不可用，服务器暂时过载或维护。',
  504: '网关超时。',
};

function checkStatus(response) {
  if (response.status >= 200 && response.status < 300) {
    return response;
  }
  switch (response.status) {
    case 403:
    case 400:
    case 500:
      return response;
    default:
  }
  const errorMsg = codeMessage[response.status] || response.message;
  notification.error({
    message: `请求错误 ${response.status}: [${response.url}]`,
    description: errorMsg,
  });
  const error = new Error(errorMsg);
  error.name = response.status;
  error.response = response;
  throw error;
}

/**
 * Requests a URL, returning a promise.
 *
 * @param  {string} url       The URL we want to request
 * @param  {object} [options] The options we want to pass to "fetch"
 * @return {object}           An object containing either "data" or "err"
 */
export default function request(url, options = {}) {
  const token = localStorage.getItem('token');
  const defaultHeaders = {
    Accept: 'application/json',
    'X-Auth-Token': token,
    // 'X-Auth-OEM': '924946155891064834',
  };

  let { headers = {} } = options;

  const newOptions = { ...options };
  newOptions.headers = { ...defaultHeaders, ...headers };

  if (newOptions.headers && newOptions.headers['Content-Type'] ) {
    newOptions.body = toFormData(newOptions.body);
  }


  if (
    newOptions.method === 'POST' ||
    newOptions.method === 'PUT' ||
    newOptions.method === 'DELETE'
  ) {
    if (!(newOptions.body instanceof FormData)) {
      newOptions.headers = {
        // Accept: 'application/json',
        // 'X-Auth-Token': token,
        'Content-Type': 'application/json; charset=utf-8',
        ...newOptions.headers,
      };
      newOptions.body = JSON.stringify(newOptions.body);
    } else {
      // newOptions.body is FormData
      newOptions.headers = {
        // 'X-Auth-Token': token,
        // Accept: 'application/json',
        ...newOptions.headers,
      };
    }
  }

  return fetch(url, newOptions)
    .then(checkStatus)
    .then(response => {
      // 请求成功
      // if (newOptions.method === 'DELETE' || response.status === 204) {
      //   return response.text();
      // }
      return response.json();
    })
    .catch(e => {
      const { dispatch } = store;
      const status = e.name;
      if (status === 401) {
        // dispatch({ type: 'login/logout' });
        return e;
      }
      if (status === 403) {
        dispatch(routerRedux.push('/exception/403'));
        return;
      }
      if (status <= 504 && status >= 500) {
        dispatch(routerRedux.push('/exception/500'));
        return;
      }
      if (status >= 404 && status < 422) {
        dispatch(routerRedux.push('/exception/404'));
      }
    });
}

export function toFormData(params) {
  let form = new FormData();

  // 遍历参数 将参数封装成fromData
  // let keys = Object.keys(params);
  //
  // keys.forEach((key) => {
  //   let value = params[key];
  //   if (value !== null) {
  //     if ('file' !== key)  {
  //       key = 'bankVO.'+ key;
  //     }
  //     form.append(key, value);
  //   }
  // });

  let { file, ...other } = params;

  form.append('bankVO', new Blob([
    JSON.stringify(other),
  ], {
    type: 'application/json',
  }));

  form.append('file', file);

  return form;
}

